please give correct answer i request you. The answer of this question is $690.07

4.2 The input-output curve of a gas-fired generating unit is approximated by the following function: H(P) = 120 +9.3 P +0.0025 P2 MJ/h This unit has a minimum stable generation of 200 MW and a maximum output of 500 MW. The cost of gas is 1.20 $/ MJ. Over a 6-h period, the output of this unit is sold in a market for electrical energy at the prices shown in the table below. Period 2 3 4 5 6 Price ($/MWh) 12.5 10 13 13.5 15 11 Assuming that this unit is optimally dispatched, is initially on-line and cannot be shut down, calculate its operational profit or loss for this period